From bb0bb3b6596cdb08adb0b72453cc67d48e139c2c Mon Sep 17 00:00:00 2001 From: Paul Mackerras Date: Sat, 10 Sep 2005 21:13:11 +1000 Subject: [PATCH] ppc32: Kill init on unhandled synchronous signals This is a patch that I have had in my tree for ages. If init causes an exception that raises a signal, such as a SIGSEGV, SIGILL or SIGFPE, and it hasn't registered a handler for it, we don't deliver the signal, since init doesn't get any signals that it doesn't have a handler for. But that means that we just return to userland and generate the same exception again immediately. With this patch we print a message and kill init in this situation. This is very useful when you have a bug in the kernel that means that init doesn't get as far as executing its first instruction. :) Without this patch the system hangs when it gets to starting the userland init; with it you at least get a message giving you a clue about what has gone wrong. Signed-off-by: Paul Mackerras Signed-off-by: Linus Torvalds --- include/asm-ppc/system.h | 1 + 1 file changed, 1 insertion(+) (limited to 'include/asm-ppc') diff --git a/include/asm-ppc/system.h b/include/asm-ppc/system.h index 513a334c581..d754ab570fe 100644 --- a/include/asm-ppc/system.h +++ b/include/asm-ppc/system.h @@ -88,6 +88,7 @@ extern void *cacheable_memcpy(void *, const void *, unsigned int); extern int do_page_fault(struct pt_regs *, unsigned long, unsigned long); extern void bad_page_fault(struct pt_regs *, unsigned long, int); extern void die(const char *, struct pt_regs *, long); +extern void _exception(int, struct pt_regs *, int, unsigned long); #ifdef CONFIG_BOOKE_WDT extern u32 booke_wdt_enabled; extern u32 booke_wdt_period; -- cgit v1.2.3